The Problem of Abundances for “Metal-Rich” Globular Clusters

Abstract

The discrepancy between the results of recent high-dispersion analyses and of studies at lower resolution for the classical metal-rich globular clusters is discussed and different explanations for this discrepancy are considered. It is concluded that further systematic investigations are motivated in order to establish the more or less interesting astrophysical explanations for it.

Main-sequence photometry for three galactic globular clusters

“…The first two of these were selected for their current high astrophysical interest (cf. the reviews by Cannon 1981aCannon , 1983Gustafsson 1983;or VandenRerg 1983). Our observations of NGC 1904 were originally obtained for determination of color-equation terms from observations near the horizontal-branch level, but its main sequence turned out to be easily reachable as well with short exposure times and was something of a bonus in the program results.…”